Adjustable by-pass check valve



M. J. BARKER ADJUSTABLE BY-PASS CHECK VALVE Aug` 30, 1949.

Filed Jan. 29. 1946 FIG.2.

?atenied ug. 30, 194g UNITED STATES OFFICE. i

2,480,1082 ADJUSTABLE, BY-PAss CHECK VALVE Martin J. Barker, San' Francisco; Galr'ff. Application January 29, 19461, Serial o 644,092

1 Claim. (Cl. 210-164) This invention relates to an adjustable check valve and by-pass for oil lters, and more particularly to such oil lters as applied to internal combustion engines. i

A primary object of this invention is the provisionv of an improved adjustable check valve adapted to check the flow of oil through thefilter at low speed, thereby holding the oil pressure up while theV motor is idling, assuring safe lubrication and simultaneously releasing excess pressure through the filter at high speed, thus reducing the danger of excess oil supply and consumption, on engines of the internal combustion type utilizing oil lters.

A further object of the invention is the provision of such a device which will be sturdy and durable in construction, reliable and eiiicient in operation, and relatively simple and inexpensive to manufacture, assemble and install.

Other objects reside in the combinations of elements, arrangements of parts and features of construction, all as will be more fully pointed out hereinafter and shown in the accompanying drawings wherein there is disclosed a preferred embodiment of this inventive concept.

In the drawings:

Figure 1 is a side elevational partially diagrammatic view of an internal combustion engine having an oil lter applied thereto, certain concealed portions thereof being indicated in dotted lines.

Figure 2 is a vertical sectional view, enlarged, of an oil lter adapted to be applied to an internal combustion engine, showing the check valve of the instant invention in association therewith.

Figure 3 is an enlarged longitudinal sectional View of the check valve showing the adjustable feature thereof.

Figure 4 is a sectional View taken substantially along the line 4--4 of Figure 3.

Similar reference characters refer to similar parts throughout the several views of the drawings.

Having reference now to the drawings, and more particularly to Figure l, there is generally indicated at I the motor block of a conventional internal combustion engine, provided with a head II, and having secured thereto an oil filter generally indicated at I2. An oil pump I3 of conventional design is provided connected by a line I4 to the pressure line I5 of the motor. From .pressure line l5 an oil inlet I6 leads to the fllter l2, and an oil outlet line I'I extends from the filter to the oil pan I8.

I-lavirig` particular reference now toFgure 2, it will be seenthat the oil i-fllter" If2 includes a casing 2li provided with acove'r 2l and having an internally positioned irl-let tube 22 provided with periorations 23 to permi-tlthepassage' oi oil cuitwardly therefrom'. Suitable packing is provided, asat 251; surrounding the tube 22i and inset. a suitable groove or recess inl the lid or cover 2T, andthe device is held iin assembled relation by a lid screw 2E. A filter cartridge 24 of conventional des'ign is positionedy around the inlet. tube 22 and th-'e outlet tube- It ifs suitably threaded into a threaded aperture 28 positioned in the side of the casing 2U.

Suitable packing 29 is also provided adjacent the inlet of the device and surrounds the inlet tube I6, which threadedly engages suitable threads in a lower counterbore 3U in the base of the inlet tube 22.

Having particular reference now to Figure 3, it will be seen that the inlet tube 22 is provided near its lower, flanged end with an internal plug 34 having a central bore of reduced diameter therethrough and at each side of the plug with counterbores comprising an upper counterbore 36 and a lower counterbore 36, both of which are internally screw-threaded, as indicated at 3l and 35 respectively. At its upper end the plug bore 31 is beveled to provide a valve seat 38, and a valve ball 39 in upper counterbore 36 is engageable with this seat. A screw plug 32 having a central bore 33 is threaded into the upper counterbore 36 above the plug 34, and a, compression spring 46 is interposed between this screw plug and the valve ball to resiliently seat the ball on the valve seat 38. The reduced plug bore 31 opens into the lower counterbore 3B which lower counterbore receives the adjacent end portion of the oil inlet tube I6.

From the foregoing the operation of the device should now be readily understandable. When the motor is idling, it will be seen that the force exerted by the spring 40 serves to bias the ball valve 39 against the seat 38 against the relatively low pressure of the oil being circulated by the motor at low speed, thus by-passing the oil from the filter directly into the pressure line I5 for recirculation through the system. Conversely, however, as the pressure increases, the pressure in the system is sufficient to unseat the valve 39 from its associated seat, whereupon oi1 is permitted to circulate through the inlet tube 22 through the filter cartridge 21 and to the outlet line I'I.

While in the foregoing the device has been described as positioned in the inlet line it will be readily apparent that if desired the device may be positioned at any desired location in the lter system, according to the type of iilter or system utilized.

From the foregoing it will now be seen that there is herein provided an improved check valve for internal combustion engines which accomplishes all the objects of this invention, and others, including many advantages of great practical utility and commercial importance.

As many embodiments may be made of this inventive concept, and as many modications may be made in the embodiment hereinbefore shown and described, it is to be understood that all matter herein is to be interpreted merely as illustrative and not in a limiting sense.

I claim:

In a lubricating oil lter having a hollow, cup- Y ing said bottom wall, screw threads on said tube adjacent its opposite end, a nut threaded on said tube and bearing upon said lid, said tube having Derforations in its wall between said collars and having near its flanged, lower end a plug provided with a bore of reduced diameter and internally screw-threaded counterbores disposed one at each side of said plug, a valve b-all overlying the upper end of said plug bore, an apertured screw plug threaded into the counterbore above said plug, and a compression spring between said screw plug and said valve b-all to resiliently seat said valve ball in the upper end of said plug bore, said counterbore below said plug receiving the end portion of an oil inlet tube.

MARTIN J. BARKER.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,496,947 Robinson June 10, 1924 1,718,390 Sweetland June 25, 1929 1,766,847 Tibbetts June 24, 1930 1,896,395 Dooley Feb. 7, 1933 1,955,903 Cammen Apr. 24, 1934 1,996,469 Frolander Apr. 2, 1935 2,098,725 Hurn Nov. 9, 1937 2,253,685 Burckhalter Aug. 26, 1941 

